Coal production
0reported short tons
ALL STATUSES / CONTROLLER PORTFOLIO
Minerals Technologies Inc
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA CONTROLLER IDM00362
MINE PORTFOLIO
51 of 51 mines and facilities
2025-01-01 – 2026-10-18. All statuses records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| ADAMS1900035 · Active6/8 quarters reported | Berkshire, MASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 351,774 | 192 | 3 | 523.3 |
| Belle/Colony Mine4800888 · Active6/8 quarters reported | Crook, WYSurface · MSHA: Bentonite | 0 | 237,549 | 25 | 6 | 112.3 |
| BELLE FOURCHE MILL3900049 · Active6/8 quarters reported | Butte, SDFacility · MSHA: Bentonite | 0 | 19,037 | 5 | 0 | 38.8 |
| Canaan0600019 · Active6/8 quarters reported | Litchfield, CTSurface · MSHA: Crushed, Broken Limestone NEC | 0 | 90,837 | 89 | 4 | 321.0 |
| COLONY EAST MILL4800594 · Active6/8 quarters reported | Crook, WYFacility · MSHA: Bentonite | 0 | 97,765 | 6 | 0 | 39.8 |
| COLONY WEST MILL4800245 · Active6/8 quarters reported | Crook, WYFacility · MSHA: Bentonite | 0 | 118,889 | 7 | 2 | 35.0 |
| GASCOYNE MINE & MILL3200459 · Active6/8 quarters reported | Bowman, NDFacility · MSHA: Leonardite | 0 | 35,807 | 33 | 0 | 112.5 |
| Lovell Mill4800057 · Active6/8 quarters reported | Big Horn, WYFacility · MSHA: Bentonite | 0 | 166,387 | 7 | 0 | 23.8 |
| Lucerne Valley Plant and Quarry0400219 · Active6/8 quarters reported | San Bernardino, CASurface · MSHA: Crushed, Broken Limestone NEC | 0 | 256,225 | 55 | 1 | 215.3 |
| SANDY RIDGE MILL0100093 · Active6/8 quarters reported | Lowndes, ALSurface · MSHA: Common Clays NEC | 0 | 56,129 | 6 | 0 | 49.0 |
| Specialty Minerals Inc.2302564 · Active6/8 quarters reported | Ste Genevieve, MOFacility · MSHA: Lime | 0 | 2,880 | 1 | 0 | 51.3 |
| Yellowtail Mine4800607 · Active6/8 quarters reported | Big Horn, WYSurface · MSHA: Bentonite | 0 | 34,873 | 1 | 0 | 19.0 |
| Acme Mine0401092 · Abandoned | Inyo, CAUnderground · MSHA: Talc | — | — | 0 | 0 | — |
| American Colloid Pits4800961 · Abandoned | Crook, WYSurface · MSHA: Fire Clay | — | — | 0 | 0 | — |
| Apex Excelior Mine0401093 · Abandoned | Inyo, CAUnderground · MSHA: Talc | — | — | 0 | 0 | — |
| Belle Mine2401775 · Abandoned | Carter, MTSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Bonny Pit0401094 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Broadhurst Mine3901312 · Abandoned | Butte, SDSurface · MSHA: Fire Clay | — | — | 0 | 0 | — |
| C 1 Clay Pit0404342 · Abandoned | Inyo, CASurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Comet Pit0404341 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Crystal Mine4800606 · Abandoned | Big Horn, WYSurface · MSHA: Misc. Nonmetallic Mnls. NEC | — | — | 0 | 0 | — |
| Death Valley Area Mines0400585 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| De Voe Mine0404709 · Abandoned | San Bernardino, CASurface · MSHA: Misc. Nonmetallic Mnls. NEC | — | — | 0 | 0 | — |
| Eclipse Mine0401098 · Abandoned | Inyo, CAUnderground · MSHA: Crushed, Broken Limestone NEC | — | — | 0 | 0 | — |
| Excelsior Pit0404505 · Abandoned | San Bernardino, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Foster Mine (Portable/Seasonal)2401447 · Abandoned | Carter, MTSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Gibsonburg3300138 · Abandoned | Sandusky, OHSurface · MSHA: Lime | — | — | 0 | 0 | — |
| Grantham Mine0402656 · Abandoned | Inyo, CAUnderground · MSHA: Talc | — | — | 0 | 0 | — |
| Grantham Pit0404625 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Illite0404604 · Abandoned | San Bernardino, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Kingston Springs Mine0404721 · Abandoned | San Bernardino, CASurface · MSHA: Misc. Nonmetallic Mnls. NEC | — | — | 0 | 0 | — |
| Malta Mine2401435 · Abandoned | Phillips, MTSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Malta Plant2401437 · Abandoned | Phillips, MTFacility · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Mammoth Mine0404265 · Abandoned | Inyo, CAUnderground · MSHA: Talc | — | — | 0 | 0 | — |
| Mongolian Pit0404264 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Nassau Mine2601891 · Abandoned | Pershing, NVSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Old Gold Mine4801101 · Abandoned | Weston, WYSurface · MSHA: Fire Clay | — | — | 0 | 0 | — |
| PARIS, TN PLANT4000204 · Abandoned | Henry, TNSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| P V Clay Mine0400534 · Abandoned | Kern, CASurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Ridge Mine3900844 · Abandoned | Butte, SDSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Rogers Mine0404610 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| Sellers Pit0102565 · Abandoned | Lowndes, ALSurface · MSHA: Clay, Ceramic, Refractory Mnls. | — | — | 0 | 0 | — |
| Sericite Pit0404343 · Abandoned | Inyo, CASurface · MSHA: Mica | — | — | 0 | 0 | — |
| Superior0401103 · Abandoned | Inyo, CASurface · MSHA: Talc | — | — | 0 | 0 | — |
| UPTON MILL & MINE4800059 · Abandoned | Weston, WYSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Upton Mine4800807 · Abandoned | Weston, WYSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| Upton West Mill4800597 · Abandoned | Converse, WYFacility · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| U S Gypsum Claim0404498 · Abandoned | Riverside, CASurface · MSHA: Clay, Ceramic, Refractory Mnls. | — | — | 0 | 0 | — |
| Victorville Quarry Mill0403495 · Abandoned | San Bernardino, CAFacility · MSHA: Talc | — | — | 0 | 0 | — |
| West Mine2401436 · Abandoned | Phillips, MTSurface · MSHA: Common Clays NEC | — | — | 0 | 0 | — |
| White Point0404645 · Abandoned | Inyo, CAUnderground · MSHA: Talc | — | — | 0 | 0 | — |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
Portfolio map
13 of 51 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- ADAMS42.64306, -73.11222Open map ↗
- Belle/Colony Mine44.71028, -103.89972Open map ↗
- BELLE FOURCHE MILL44.68111, -103.85194Open map ↗
- Canaan42.02667, -73.32167Open map ↗
- COLONY EAST MILL44.86556, -104.14944Open map ↗
- COLONY WEST MILL44.86972, -104.16000Open map ↗
- GASCOYNE MINE & MILL46.11167, -103.04778Open map ↗
- Lovell Mill44.96139, -108.29000Open map ↗
- Lucerne Valley Plant and Quarry34.36722, -116.91139Open map ↗
- SANDY RIDGE MILL32.05333, -86.43111Open map ↗
- Specialty Minerals Inc.37.97722, -90.06806Open map ↗
- Yellowtail Mine44.96139, -108.29000Open map ↗
- Nassau Mine40.18531, -118.47142Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 51 mines listed under this controller were checked; 12 have reports in the available quarters. Totals use current ownership.
Hours worked
1,468,152reported employee hours
Tons per hour
0.00production ÷ hours worked
Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.
Quarterly data and reporting coverage
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 236,802 | 0.00 | 501 | 12/12 mines reporting |
| 2025 Q2 | 0 | 248,030 | 0.00 | 514 | 12/12 mines reporting |
| 2025 Q3 | 0 | 256,334 | 0.00 | 531 | 12/12 mines reporting |
| 2025 Q4 | 0 | 230,479 | 0.00 | 544 | 12/12 mines reporting |
| 2026 Q1 | 0 | 250,006 | 0.00 | 513 | 12/12 mines reporting |
| 2026 Q2 | 0 | 246,501 | 0.00 | 511 | 12/12 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
42772 significant & substantial (S&S)
Accident records
160 records classified as fatality
Proposed penalties · USD
140,019.00421 of 427 violations with amounts
On-site inspection hours
1,540.7569 inspections · 69 with hours
Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.
Quarterly safety data
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 125 | 19 | 32,881.00 | 4 | 0 | 13 | 385.0 |
| 2025-Q2 | 110 | 16 | 37,036.00 | 0 | 0 | 6 | 284.8 |
| 2025-Q3 | 40 | 10 | 10,817.00 | 4 | 0 | 14 | 201.3 |
| 2025-Q4 | 7 | 1 | 2,713.00 | 2 | 0 | 4 | 60.3 |
| 2026-Q1 | 44 | 7 | 14,473.00 | 3 | 0 | 11 | 232.5 |
| 2026-Q2 | 92 | 17 | 41,646.00 | 0 | 0 | 14 | 316.0 |
| 2026-Q3 | 5 | 2 | 453.00 | 3 | 0 | 4 | 38.3 |
| 2026-Q4 * | 4 | 0 | — | 0 | 0 | 3 | 22.8 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Lucerne Valley Plant and Quarry · 0400219
56.12004 · $151.00 proposed
- Lucerne Valley Plant and Quarry · 0400219
47.54(a) · $209.00 proposed
- Lucerne Valley Plant and Quarry · 0400219
Regular Safety and Health Inspection · 39.5 on-site hours
- Lovell Mill · 4800057
Regular Safety and Health Inspection · 9.8 on-site hours
- Yellowtail Mine · 4800607
Regular Safety and Health Inspection · 8.5 on-site hours
- Lovell Mill · 4800057
56.12030 · $177.00 proposed
- Lovell Mill · 4800057
56.4603(b) · $177.00 proposed
- Lovell Mill · 4800057
56.12028 · $177.00 proposed
- ADAMS · 1900035
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While walking into a building, a miner slipped on a walkway and attempted to brace themselves to prevent a fall. Miner was able to stop the fall but reported right shoulder discomfort. Physician approved to continue work without restrictions. After continued soreness an MRI resulted in a slight tear on 5/29/2026. Operator received documentation on 6/2/2026.
- GASCOYNE MINE & MILL · 3200459
56.12013(a) · $642.00 proposed
- GASCOYNE MINE & MILL · 3200459
56.4201(a)(2) · $193.00 proposed
- GASCOYNE MINE & MILL · 3200459
56.11008 · S&S · $959.00 proposed
- GASCOYNE MINE & MILL · 3200459
47.41(a) · $193.00 proposed
- GASCOYNE MINE & MILL · 3200459
56.12025 · $288.00 proposed
- GASCOYNE MINE & MILL · 3200459
56.14207 · $193.00 proposed
- GASCOYNE MINE & MILL · 3200459
Regular Safety and Health Inspection · 22.3 on-site hours
- GASCOYNE MINE & MILL · 3200459
56.17001 · $245.00 proposed
- Belle/Colony Mine · 4800888
Regular Safety and Health Inspection · 21.0 on-site hours
- Specialty Minerals Inc. · 2302564
Regular Safety and Health Inspection · 8.0 on-site hours
- Belle/Colony Mine · 4800888
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
An employee was moving a 3-inch pump. The employee mis stepped into a soft spot, and right leg got stuck approximately 8 to 10 inches deep in the mud. When the employee pulled their leg out of the mud, they felt their right knee pop. The employee is now using crutches
- BELLE FOURCHE MILL · 3900049
Regular Safety and Health Inspection · 9.0 on-site hours
- COLONY WEST MILL · 4800245
HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was tightening a bolt on a bar disintegrator when the wrench slipped off hitting the employee in the mouth causing a small cut on the upper part of the chin and a chipped tooth.
- ADAMS · 1900035
Compliance Follow-up Inspection · 3.0 on-site hours
- Lucerne Valley Plant and Quarry · 0400219
56.14112(b) · $151.00 proposed
- Lucerne Valley Plant and Quarry · 0400219
56.14112(b) · $177.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.
Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.
Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.
S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.
Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.
Portfolio totals use current mine membership, including events before the current owner or operator's tenure.
CFR headings link to the current Title 30 index; they are not historical legal determinations.
SELECTED PORTFOLIO
3 linked operators.
Relationships reflect the selected mine status and current MSHA controller/operator fields.